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Atom economy and greener reactions

11th grade (Year 12 in England) · 16 questions · Common Core: NGSS.HS-PS1-7, NGSS.HS-ETS1-3 · England: GCSE Chemistry: Quantitative chemistry (atom economy)

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  1. Question 1

    Atom economy and percentage yield are different. Which statement is correct?

    • A. Yield comes from the equation only
    • B. They are always equal
    • C. Atom economy comes from the equation; yield comes from what you actually collect
    • D. Atom economy is measured with a balance

  2. Question 2

    Atom economy: which statement is NOT true?

    • A. Reactions with only one product have 100 % atom economy.
    • B. Selling or using by-products makes a process less wasteful.
    • C. Thermal decomposition of calcium carbonate has 100 % atom economy for calcium oxide.
    • D. Atom economy is calculated from the balanced equation.

  3. Question 3

    Zn + 2HCl → ZnCl₂ + H₂. The useful product is zinc chloride (Mr 136). Relative masses of reactants: Zn = 65, HCl = 36.5. What is the atom economy? Give 1 decimal place.

    Answer%

  4. Question 4

    What does a 100 % atom economy mean?

    • A. No energy is needed
    • B. The yield is always 100 %
    • C. The reaction is very fast
    • D. All the atoms in the reactants end up in the desired product

  5. Question 5

    Atom economy: which statement is NOT true?

    • A. Selling or using by-products makes a process less wasteful.
    • B. Reactions with only one product have 100 % atom economy.
    • C. Green chemistry aims to use reactions with high atom economy.
    • D. Thermal decomposition of calcium carbonate has 100 % atom economy for calcium oxide.

  6. Question 6

    C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂. The useful product is ethanol (Mr 46). Relative masses of reactants: C₆H₁₂O₆ = 180. What is the atom economy? Give 1 decimal place.

    Answer%

  7. Question 7

    Atom economy and percentage yield are different. Which statement is correct?

    • A. Atom economy is measured with a balance
    • B. Yield comes from the equation only
    • C. Atom economy comes from the equation; yield comes from what you actually collect
    • D. They are always equal

  8. Question 8

    Atom economy: which statement is NOT true?

    • A. A low atom economy means the reaction is fast.
    • B. Reactions with only one product have 100 % atom economy.
    • C. Green chemistry aims to use reactions with high atom economy.
    • D. Selling or using by-products makes a process less wasteful.

  9. Question 9

    Zn + 2HCl → ZnCl₂ + H₂. The useful product is zinc chloride (Mr 136). Relative masses of reactants: Zn = 65, HCl = 36.5. What is the atom economy? Give 1 decimal place.

    Answer%

  10. Question 10

    Why does a low atom economy matter for sustainability?

    • A. It removes pollution
    • B. It increases the yield
    • C. It makes products cheaper
    • D. More resources are turned into waste products

  11. Question 11

    Atom economy: which statement is NOT true?

    • A. Thermal decomposition of calcium carbonate has 100 % atom economy for calcium oxide.
    • B. Atom economy is calculated from the balanced equation.
    • C. Reactions with only one product have 100 % atom economy.
    • D. Selling or using by-products makes a process less wasteful.

  12. Question 12

    Zn + 2HCl → ZnCl₂ + H₂. The useful product is zinc chloride (Mr 136). Relative masses of reactants: Zn = 65, HCl = 36.5. What is the atom economy? Give 1 decimal place.

    Answer%

  13. Question 13

    Why does a low atom economy matter for sustainability?

    • A. It increases the yield
    • B. It makes products cheaper
    • C. It removes pollution
    • D. More resources are turned into waste products

  14. Question 14

    Atom economy: which statement is NOT true?

    • A. Reactions with only one product have 100 % atom economy.
    • B. Green chemistry aims to use reactions with high atom economy.
    • C. Atom economy is calculated from the balanced equation.
    • D. Thermal decomposition of calcium carbonate has 100 % atom economy for calcium oxide.

  15. Question 15

    2H₂O → 2H₂ + O₂. The useful product is hydrogen (Mr 2). Relative masses of reactants: H₂O = 18. What is the atom economy? Give 1 decimal place.

    Answer%

  16. Question 16

    Atom economy and percentage yield are different. Which statement is correct?

    • A. Yield comes from the equation only
    • B. They are always equal
    • C. Atom economy comes from the equation; yield comes from what you actually collect
    • D. Atom economy is measured with a balance

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  1. Atom economy comes from the equation; yield comes from what you actually collect
  2. Thermal decomposition of calcium carbonate has 100 % atom economy for calcium oxide.
  3. 98.6 %
  4. All the atoms in the reactants end up in the desired product
  5. Thermal decomposition of calcium carbonate has 100 % atom economy for calcium oxide.
  6. 51.1 %
  7. Atom economy comes from the equation; yield comes from what you actually collect
  8. A low atom economy means the reaction is fast.
  9. 98.6 %
  10. More resources are turned into waste products
  11. Thermal decomposition of calcium carbonate has 100 % atom economy for calcium oxide.
  12. 98.6 %
  13. More resources are turned into waste products
  14. Thermal decomposition of calcium carbonate has 100 % atom economy for calcium oxide.
  15. 11.1 %
  16. Atom economy comes from the equation; yield comes from what you actually collect